Grinding machine



GRINDING MACHINE 2 Sheets-$heef Filed Feb. 19. 1929 April 28, 1931. OSHEPPARD JR 1,803,148

I GRINDING MACHINE Filed Feb. 19. 1929 2 Sheets-Sheet 2 wuenio'a El IPatented Apr. 28, 1931 I ORLANDO SHEPPARD, an, 025 ATLANTA,,GEOBGIAGRINDING MACHINE Application filed February. 19, 1929. sem no. 341,1 9;

The present invention relates to improvements in grinding machines,one=object of -the invention being the provision of'a machine of thischaracter which is especially designed for grinding feed, in-which atsometime foreign substances are introduced which tend to injure thegrinding-elements, the mov able elementsin the present'structure beingso arranged as to give when too rigidan l0 object isencountered, so thatthere-is nodang'er of injuringthe rotating part or the fixed part of thepresentmachine.

Another object of this invention is thepro vision of a novelmounting ofrotor-carried element, the element} of which ismounted for independentswinging movement 'in'the circumferential line of the rotor, and also aslight radial movement, there being provided means for limiting theswinging movement of 2 said element.

A still further object of this invention is the provision of a segmentalblade for a grinding machine of this type, the arcuate edge of which isprovided with teeth and which is constructed with a novel'm-ethodi ofpivoting the sameso that the blade has the desired swinging. movementdue to the rotation of the rotor, and also due'to the meeting of anyunusual obstruction within the machine, said blades being adapted to bearranged in proper order throughout the periphery of the rotor so as toproduce the best grinding eifect in a machine of this character.

In the accompanying drawings Figure 1 is a vertical sectional viewthrough the grinding machine showing the rotor in side elevation withbroken lines indicating the position of one of the blade members 0 whenengaging a foreign body;

Figure 2 is a top plan view with the upper portion of the casingandfixed grinding element removed, showing the'rotor in top elevation;

'Figure 3 is'an enlarged detail view, partially sectional, andelevational, of one of the blade-carrying members of the rotor with theblades positioned thereon; V

Figure 4 is a section taken on line H of 59 Figure 3;'

Figure'5is a view similarto Figure'lshowinga-modified form of blademounting; and Figure 6 is a section throng-1r therot'or shown in Figure5. f 5

' Referring tot-he drawings, and more particularly to Figures l'to l,the numeral 7 designates the baseor support for-the res-5 ent grindingmachine, which consists of the semi-cylindrical upper portion 8 having.the attaching 'flange S and with thefeedin-g hopper 9 which opensatlOi-nto the casing to deliverth'e material to be ground. The innersurface of the portion 8' ofthecasing is provided with the transverselydisposed and fiXedgrind'ingelement-s or slats '11, while PATENT oFFicacarried in the lower portion of themachine and Within the space 7thereof is a semicylindric'al'screen 12 through which the pulverized orground material is delivered.

The shaft 13 extends transversely" of the grinding machine and has fixedthereto the rotor 'lkwhichis composed of a plurality of spaced disks 15secured together by means of the retaining rods 16Ian-d 17," said rods16and l'l'being arranged alternately throughout the circumference of thedisks, and in addition to-acting as tie-rods, also act, as willapres.ently appear, for supportingjthe pivoted grinding elements and for;acting as alimits ingmeans for thei swing-ing movement the-reof. Eachgrinding element which is carried bycthe rotor consistsofan :aperturedleg or tongue 18 adapted to be pivoted between the disks 15 andiupontherespective' rodslfi of the rotor, the same beingperniittedcircumferential swingingmovement during therotation of the rotor andprovided with thebar or bridged portion 19 which, as shown in dottedlines in Figure'l, coacts, with the periph'ery of one of the disks 15 tolimit the swing ng in either direction. a p Formed integral with: thebar or-' bridged por'tion- 19 are three supports or fingers -20, 21

and 22 which, in turn, "are" apertured to re ceive the screw-E23,said-screw being locked against rotation throughthe instrumentalityofthesetiscrewfi mounted'linthe support 21-.

Disposed upon this screw :between therespecfiver-supports for; fingerae; ,21 xanda2'2 .a

so I

movement of the complete element plurality of alternating disks andblades 26, these blades 26 being mounted for independent swingingmovement upon the bolt or screw 23 so as to assume independent positionsduring the rotation of the rotor should they individually engage foreignsubstances, such as gravel, metal, or the like, during the grinding ofthe material.

Each one of these blades 26, as clearly illustrated in Figure 4, is madesegmental in outline and is provided with the elongated opening 27 whichfits upon the bolt 23, and thus, in addition to permitting the blade tohave individual swinging movement,permits a longitudinal movementthereof so that the toothed periphery 28 of the blade may assume therespective full and dotted line positions as shown in Fugre 4 during therotation of the complete mechanism.

By making the bl de -carrying member18 as illustrated,the same can bepositioned between the disks '15 by the removal ofthe tierods or bolts16, and in operation it is prefer-' able that thesemembers be staggered,as illustrated in Figure 2, so that they do not interffere one with theother during the independent movements imparted thereto bythe rapidrotation of the rotor and the engagement of the respective blades ofthese members with any foreign hard substances that would normallyinterfere with the normal grinding action.

It will also be noted that each blade has independent movement separatefrom the carrying member and that, therefore, smaller substances thatwould tend to bend or break the blade or jam the machine will beaccommodated. T i

In the structure shown in Figures 5 and 6, the rotor is composed of aplurality of disks 30'carrying the tie' rods or bolts 31, the spacingwashers 35 and the enlarged disks 36, said disks 36 being arranged inpairs so as to receive therebetween, and for oscillatory move ment uponthe tie-rods or bolts 31, the respective segmental blades 33, theapertures 32 of which are similar to those shown in Figures 3 and 4,except that the blades are mounted directlyupon the rods' and are notcarried by the independent carrying members.

From the foregoing description, taken in connection with the drawings,it is evident that with a rotor constructed according to and embodyingthe present invention, the

' between the fingers of said bar to individually slide longitudinallyand to individually swing relatively to one another and to said fingers,each of said plates having the edge of its outer end serrated and formedas the arc of a circle.

2. A grinding element for hammer mills, comprising a bladercarrierincluding a bar having a tongue formed integrally therewith adapted-forpivotal connection to a rotor and projecting fromone of the faces ofsaid bar and a plurality of fingers formed integrally with said bar andprojecting from its opposite face, said fingers having alignedtransverse apertures and said tongue having an aperture parallel to theapertures of said fingers, a plurality of relatively close,substantiallysegmental flat plates mounted side by side between thefingers of said blade carrier, each of said plates having an elongatedaperture adjacent one of its ends in alignment with the apertures ofthe'other plates and having the edge of its opposite end serrated andformed as an arc of. a circle, and a pin extending through the aperturesof said fingers and of the blades mounted therebetween and on which saidblades are individually free to slide longitudinally and individuallyfree to swing relatively to one another and to said fingers. V

' In testimony whereof I have hereunto set In hand.

. y ORLANDO SHEPPARD, 'JR.

grinding elements areiof the hammer type and are so mounted andconstructed as to have independent circumferential swinging movement andradialsliding movement with regard to the fixed grinding elements of the

